How can I get my usual interface when opening projects created by other people?
Everyone uses blender in a different way and reconfigures the user interface to their needs. The user interface is saved as part of the project.

You can load other people's projects using your own user interface this way:

Close the project.

Then go to file open, uncheck the load UI box and then open the project.



In newer versions you need to click on the gear on the top right of the window to see the LoadUI option.